To evaluate video instance shadow detection,
we extend the evaluation metric SOAP[1]} for single-image instance shadow detection to videos.
A sample is considered a true positive when the Intersection-over-Union (IoU) between the predicted and ground-truth shadow instances, object instances, and shadow-object associations are all no less than a threshold \(\tau \) .
Specifically, we replace the IoU in SOAP with the spatio-temporal IoU in [2]} and name the updated metric as SOAP-VID.
We report the average over multiple \(\tau \)  [0.5:0.05:0.95] in SOAP-VID.
Using the spatio-temporal IoU, we also examine the average precision for shadow/object instance and paired shadow-object associations over the thresholds [0.5:0.05:0.95], which are denoted as Instance AP and Association AP, respectively.
